Navien NP Condensing Tankless Gas Water Heater - Service Manual
Navien NP Condensing Tankless Gas Water Heater - Service Manual
Navien NP Condensing Tankless Gas Water Heater - Service Manual
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Solenoid<br />
valve<br />
Proportional<br />
valve<br />
Adjusting screw<br />
<br />
Repeated ignition-out<br />
Flame sensing<br />
error<br />
1. Check the location of the flame detecting rod, if there is any<br />
deformation or foreign substance, and repair or replace the part.<br />
2. Check the sheath of the fire detecting wire, and if it is open.<br />
3. Check the grounding to the base, verify grounding at the outlet.<br />
There is a case of defective grounding due to the painting of exterior<br />
base. Therefore, remove the painting in the screw fastening part,<br />
and reconnect.<br />
Or use a tester to measure the flame sensing current.<br />
(normally 3~4 μA)<br />
< Grounding wire<br />
fixing position ><br />
< Measuring flame current ><br />
Defective air<br />
pressure hose<br />
Air pressur<br />
sensor<br />
1. The air pressure hose is broken.<br />
Increased RPM may cause blowout and noise.<br />
2. 10E may occur with the same trouble.<br />
The system works but combustion is not normal due to the defective<br />
air pressure sensor.<br />
Flame blo-wout<br />
and<br />
noise occurs<br />
at ignition<br />
< Defective air pressure hose ><br />
©<strong>Navien</strong> America Inc. 2010<br />
72<br />
NR/<strong>NP</strong> series service <strong>Manual</strong><br />
Version 2.0
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